Ask legal scholars to name the best Supreme Court justices of all time and seven names come up again and again: John Marshall, Oliver Wendell Holmes Jr., Louis Brandeis, Earl Warren, Thurgood Marshall, Antonin Scalia, and Ruth Bader Ginsburg. What sets them apart is not time served but the depth of the mark they left. Each wrote opinions that changed how the Constitution operates in practice, and removing any one of their contributions would leave the American legal system unrecognizable.
John Marshall Built the Court Itself
Chief Justice from 1801 to 1835, John Marshall found the Supreme Court an afterthought and left it a co-equal branch of government. Three of his opinions still frame nearly every constitutional argument made today.
Marbury v. Madison (1803) established judicial review, the power of the Court to strike down laws that conflict with the Constitution. “It is emphatically the province and duty of the Judicial Department to say what the law is,” Marshall wrote.1Justia. Marbury v. Madison Before that decision, no one had clearly settled who had the final word on constitutional meaning. After it, the Supreme Court did.
In McCulloch v. Maryland (1819), Marshall held that the federal government possesses implied powers beyond those explicitly listed in the Constitution, as long as the means are “appropriate” and “plainly adapted” to a legitimate federal purpose. He also barred states from taxing federal operations, writing that “the Government of the Union, though limited in its powers, is supreme within its sphere of action.”2Justia. McCulloch v. Maryland Without that ruling, most of what the federal government does today would have no constitutional footing.
Five years later, Gibbons v. Ogden gave Congress broad authority over interstate commerce. Marshall read the Commerce Clause expansively, saying Congress’s regulatory power “is complete in itself, may be exercised to its utmost extent, and acknowledges no limitations other than are prescribed in the Constitution.”3Justia. Gibbons v. Ogden That reading later became the constitutional basis for civil rights legislation, environmental regulation, and much else.
Oliver Wendell Holmes Jr. Made the Law Practical
Holmes sat on the Court from 1902 to 1932. Where earlier judges treated constitutional law as formal logic, Holmes argued that “the life of the law has not been logic: it has been experience.” Legal rules, he said, should reflect how society actually works. That approach made him the intellectual father of legal realism, still one of the dominant frameworks in American legal education.
In Schenck v. United States (1919), writing for a unanimous Court, Holmes introduced the “clear and present danger” test, holding that the First Amendment does not protect speech when it creates an immediate risk of serious harm Congress may prevent.4Justia. Schenck v. United States It was the Court’s first real framework for deciding when the government could restrict speech.
Holmes’s most lasting free-speech contribution came months later, in dissent. In Abrams v. United States, he argued for a much more protective standard: “the best test of truth is the power of the thought to get itself accepted in the competition of the market.” Speech should not be suppressed, he said, unless it “so imminently threaten[s] immediate interference with the lawful and pressing purposes of the law that an immediate check is required to save the country.”5Justia. Abrams v. United States The “marketplace of ideas” concept eventually became the dominant approach to free speech in American law. Holmes lost that case. His dissent won the future.
Louis Brandeis and the Right to Be Let Alone
Brandeis served from 1916 to 1939 and changed how lawyers argued cases as much as how justices decided them. Before him, briefs were built almost entirely from prior cases and abstract constitutional argument. In Muller v. Oregon (1908), representing the state before joining the bench, Brandeis filed a 113-page brief that devoted only two pages to legal argument. The rest was medical and social-science evidence about the health effects of long working hours. The Court upheld the law, and the “Brandeis Brief” became a standard tool for defending social and economic legislation.
His most enduring contribution came in a case he lost. In Olmstead v. United States (1928), the majority held that wiretapping did not violate the Fourth Amendment because no physical trespass had occurred. Brandeis dissented: “The makers of our Constitution undertook to secure conditions favorable to the pursuit of happiness… They conferred, as against the government, the right to be let alone — the most comprehensive of rights and the right most valued by civilized men.”6Legal Information Institute. Olmstead v. United States The Fourth Amendment, he argued, should protect people rather than physical property, and its principles “must be capable of wider application than the mischief which gave it birth.”
Decades later, the Court effectively adopted that view. Modern privacy law, from limits on warrantless electronic surveillance to broader questions of personal autonomy, grows directly from Brandeis’s dissent.
Earl Warren Reshaped Everyday American Life
Chief Justice from 1953 to 1969, Earl Warren led a Court that changed American life more dramatically than any other era in its history. His skill was not only in legal reasoning but in building consensus on issues that could easily have splintered the bench.
Brown v. Board of Education (1954) is the clearest example. Warren pulled every justice into a unanimous opinion declaring that racial segregation in public schools violated the Fourteenth Amendment’s guarantee of equal protection. “Separate educational facilities are inherently unequal,” the Court held, overruling the “separate but equal” doctrine that had stood since Plessy v. Ferguson in 1896.7National Archives. Brown v. Board of Education (1954) A split ruling would have handed segregationists an opening to call the decision illegitimate. Unanimity closed that door.
Miranda v. Arizona (1966) then rewrote criminal procedure. Police must warn suspects in custody of their right to remain silent and their right to an attorney before any interrogation; statements taken without those warnings are inadmissible at trial.8Justia. Miranda v. Arizona The warnings are now so embedded in American culture that most people can recite them from memory.
In Reynolds v. Sims (1964), Warren wrote for the majority to establish the “one person, one vote” principle: state legislative districts must be drawn on a roughly equal population basis. “Legislators represent people, not areas,” he wrote, and “weighting votes differently according to where citizens happen to reside is discriminatory.”9Justia. Reynolds v. Sims Before the ruling, many state legislatures were badly malapportioned, giving rural districts far more power per voter than urban ones. Warren himself later called Reynolds the most important case of his tenure, ahead of Brown.
Thurgood Marshall Brought a New Perspective to the Bench
Thurgood Marshall had already changed the Supreme Court before he ever joined it. As lead attorney for the NAACP Legal Defense Fund, he argued and won Brown v. Board of Education along with dozens of other civil rights cases, including Smith v. Allwright (1944), which struck down all-white primary elections. He won 29 of the 32 cases he argued before the justices.10U.S. Courts. Justice Thurgood Marshall Profile
When he joined the Court in 1967 as its first Black justice, Marshall brought a perspective no other justice had. Years traveling the Jim Crow South, representing defendants in capital cases and seeing how the legal system treated people without money or power, shaped everything he wrote. His reading of the Fourteenth Amendment’s Equal Protection Clause looked past formal equality to the systemic barriers that kept marginalized groups outside the Constitution’s promises.11Congress.gov. Fourteenth Amendment – Equal Protection and Other Rights
Marshall was also the Court’s most consistent critic of the death penalty. He joined the fractured majority in Furman v. Georgia (1972) that temporarily halted executions nationwide, and never retreated.12Justia. Furman v. Georgia For the rest of his career, he dissented from every ruling upholding a death sentence, arguing that capital punishment was applied in an arbitrary and racially discriminatory manner that violated the Eighth Amendment. Many of his dissents read as though written for a future generation of lawyers.
Ruth Bader Ginsburg Rewrote the Law on Sex Discrimination
Like Marshall, Ginsburg reshaped constitutional law as a litigator before joining the Court. In the 1970s, as head of the ACLU Women’s Rights Project, she argued a series of cases that pushed the Court to apply heightened scrutiny to sex-based classifications under the Equal Protection Clause. Her strategy was incremental, and she often chose male plaintiffs to show that rigid gender roles harmed everyone.
On the Court from 1993 onward, Ginsburg wrote the majority in United States v. Virginia (1996), striking down the Virginia Military Institute’s male-only admissions policy. Any government classification based on sex, the Court held, requires an “exceedingly persuasive justification” and cannot rest on “overbroad generalizations about the different talents, capacities, or preferences of males and females.”13Justia. United States v. Virginia The ruling strengthened the intermediate scrutiny standard used in gender discrimination cases.
Her dissents were often as influential as her majority opinions. In Shelby County v. Holder (2013), when the Court struck down a key enforcement provision of the Voting Rights Act, Ginsburg wrote that the preclearance regime had blocked more than 700 discriminatory voting changes between 1982 and 2006, and that dismantling it was like “throwing away your umbrella in a rainstorm because you are not getting wet.”14Legal Information Institute. Shelby County v. Holder In Ledbetter v. Goodyear (2007), her dissent calling on Congress to fix a pay discrimination loophole led directly to the Lilly Ledbetter Fair Pay Act of 2009, one of the rare instances of a dissent producing legislation within two years.
Antonin Scalia Changed How Judges Read Legal Text
Scalia served from 1986 to 2016 and reshaped how judges read both the Constitution and federal statutes. His core idea was direct: the Constitution means what its words meant to the public when they were adopted, and statutes mean what their text says, not what legislators hoped to accomplish. Originalism and textualism existed before Scalia, but he moved them from academic curiosity to the dominant framework of conservative legal thought and forced every judge to reckon with them.
His signature majority opinion was District of Columbia v. Heller (2008), holding that the Second Amendment protects an individual right to possess firearms for self-defense in the home, apart from any militia connection. Scalia reached that conclusion through detailed historical analysis of the amendment’s text, drafting history, and analogous state constitutional provisions from the same era.15Justia. District of Columbia v. Heller The opinion reads like a history seminar. For Scalia, if the historical record supported the right, modern policy concerns could not override it. The Court extended that methodology in New York State Rifle & Pistol Association v. Bruen (2022), declaring that Second Amendment challenges must be evaluated through text, history, and tradition.
Scalia’s influence on statutory interpretation may prove even more durable. Courts once routinely consulted committee reports and floor speeches to figure out what a statute meant. Scalia insisted the enacted text was the only legitimate source, and he developed interpretive rules that lawyers and judges now treat as basic tools. Law schools added statutory interpretation to the required first-year curriculum largely because of his work.
What These Justices Share
The seven do not agree with each other. Marshall and Scalia held opposing views of constitutional interpretation. Holmes and Warren disagreed sharply on how far the Court should push into social policy. What they share is the ability to write opinions that changed how people think about the law, not just how they apply it. A great justice does more than decide the case in front of them. They provide a framework other judges, lawyers, and legislators use for decades.
Several did their most important work in dissent. Holmes in Abrams, Brandeis in Olmstead, Marshall in death penalty cases, and Ginsburg in Shelby County all wrote minority opinions that later moved toward majority thinking. Judicial greatness, on this record, often means seeing where the law needs to go, writing it down clearly, and waiting for the country to catch up.